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11Alexandr11 [23.1K]
3 years ago
8

An altitude is drawn from the vertex of an isosceles triangle, forming a right angle

Mathematics
1 answer:
Leni [432]3 years ago
6 0

Answer:

P = 63.6 inches

Step-by-step explanation:

you need to find the length of the third side:

9² + 21² = c²

81 + 441 = c²

c² = 522

c = \sqrt{522}

c ≈ 22.8

P = 18 + 2(22.8)

P = 63.6 inches

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